Tread portion of an automobile tire



FIG. 1 is a perspective view of a tread portion of an automobile tire according to my design;

FIG. 2 is a front view thereof;

FIG. 3 is a plane side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a fragmentary enlarged view showing the details of the tread portion thereof; and,

FIG. 6 is an end view taken along line 6-6 in FIG. 5.

Broken lines in the drawing figures are used to show unclaimed portions of the tire, and thus form no part of the claimed design. 

CLAIM The ornamental design for a tread portion of an automobile tire, as shown and described. 